Let us pray. O God, who gave joy to the world through the resurrection of Thy Son, our Lord Jesus Christ, grant we beseech Thee, that through the intercession of the Virgin Mary, His Mother, we may obtain the joys of everlasting life. Through the same Christ our Lord. Amen
this is the regina coeli hymm, you will notice it says “through the same Christ our LORD”
“through the intercession of the Virgin Mary, His Mother”
Yes, this would be a practical result of Mary being understood as “co-mediatrix.” And, yes, I know that the intercession of other saints is also invoked, who are not considered co-mediators. Which brings us to another point. Where are we commanded or encouraged to seek the intercession of those already in heaven? And, no, I am not denying that those in heaven pray/speak to God, and surely not to our detriment. But where does it say that they hear our prayers? Or that we should pray to them? There are many questions and problems here that have no Scriptural basis.